Other Methods for Step Flashing Installation Other Methods for Step Flashing Installation
Different methods of step flashing are installed on the roof to shield the house from harmful weather disturbances like snow, rainfall and wind-blown rain. Step flashing works to shield areas that are most susceptible to these strong elements. These are usually the part of the house that are easily penetrated by water. If not protected, it can cause house mildew and other growths that are harmful to a person’s health. Step flashing is needed in the areas where the slanting roof meets the wall. Examples are chimneys, valleys, rakes, skylights and eaves. In order to resist water penetration, flashings feature different mechanisms for different areas of the house.
Open Valley flashings are used to protect the length of the valley that are exposed to the elements. There are certain areas which are expected to gather unequal water flow; a 1.5 inch high baffle is installed. This is to prevent water from rushing at high velocity against the valley flashing's opposite edge. The Closed Valley is for roofs that are intersecting. Lastly, there is also a mechanism for Unequal Slopes.
Sheet Metal Flashing
A very durable, yet expensive, material used in sheet metal flashing is copper or a lead-coated copper. Installation for this requires more skill and usually costs more. Another material is also durable and at the same time versatile. However, it is not as practical as copper. Nevertheless, its price is mid-range.
A new galvanized steel flashing’s advantages would be its low cost and rigid material. Unfortunately, it ranks low on durability. Corrosion, especially in certain environments, might occur rapidly. Together with tile or slate, it is not a cost-effective complement.
Galvalume sheet metal is similar to galvanized steel. It is also affordable, although galvanized steel is more durable with twice the life expectancy of Galvalume. A setback for Galvalume is that it must not be allowed direct contact with materials that hold moisture - like cement, concrete, and bricks - because this would lead to the deterioration of the flashings.
Stainless steel flashings are recommended for its durability and ability to withstand harsh and corrosive environments. The cost of this material is comparative to copper. But labor costs for installing stainless steel are quite high because it is difficult to manipulate.
Roll Roof Flashing
This falls under the category which uses membrane. This is a type of roof flashing is often seen in rural locations. It is mineral surfaced and implements valley installations. It can be installed quickly and yet prove durable, lasting from 15 to 25 years. Another advantage is that it does not require any special skill on the part of the person to install it. This, however, is only good with asphalt roofing material and valley flashing.
Ice and Water Barrier
This device is quite new in flashing advancements and also falls under the membrane category. Although it was first invented to address the damming of ice at the roof's eaves, it now has wider usage. It also inhibits entry of water to chimneys, skylights, valleys and other areas of penetration. This type also combats wind-blow precipitation, especially in high-wind regions.